Air Force cadet Hayley Weir had an idea that turned out to be a game changer. "It was just the concept of going out there and stopping a bullet with something that we had made in a chemistry lab." The 21-year-old Weir approached Air Force Academy Assistant Professor Ryan Burke with the idea. He was skeptical. "I said, 'I'm not really sure this is going to work, the body armor industry is a billion-plus-dollar industry," he noted. Weir's idea was to combine anti-ballistic fabric with what's known as a shear thickening fluid to create a less heavy material to use...